I recently went to BSA summer camp for a week. I brought my

deck, and ended up playing several games with one of the counselors who had brought at least a half-dozen decks as well as a lot of spare cards. He spent the whole week trying to persuade me to trade my Vampire Nocturnus, and offered me a

/artifact deck as well as several artifact rares and uncommons. I really didn't know the value of Nocturnus, but I figured it was worth it, and went ahead. He seemed pretty happy, and someone just told me Vampire Nocturnus is worth $12, so I want to know if I got ripped off. Here's what I traded for:
Artifact Creatures:
x4 Memnite
x4 Yotian Soldier
x3 Signal Pest
x3 Steel Overseer
x1 Myr Adapter
x1 Vault Skirge
x1 Spidersilk Net
Artifacts:
x1 Whispersilk Cloak
x3 Kitesail
x1 Welding Jar
x1 Shriekhorn
x2 Lashwrithe
Creatures:
x4 Skinrender
x1 Undead Warchief
x1 Phylactery Lich
x1 Slith Bloodletter
x1 Big Game Hunter
x1 Painsmith
x1 Reassembling Skeleton
x1 Gravedigger (FOIL)
Instants:
x4 Doom Blade
Lands:
x20 Swamp
Extra cards:
x2 Bonehoard
x2 Silverskin
Armorx1 Pentavus
x1 Loxodon Warhammer
x1 Phyrexian Revoker
x1 Golem Artisan
x1 Chimeric Coils
x1 Strata Scythe
EDIT: He almost tossed in a Sword of Feast and Famine. Should I have held out for it?